It is impossible to learn from someone who is more worried about the damage you may cause to their bike. In case you are not at ease with your trainer, you are simply whiling away time. Another good investment is to approach a professional institute and learn riding from a trained and skilled trainer.
After learning the basics of riding, simply continue to practice as practice makes anything perfect. Avoid riding on busy streets, highways, or interstates until you are very comfortable with your riding skills. There are skills to be practiced on various areas like how to tackle sharp bends and curves, how to brake suddenly, how to change lanes safely and these are everyday situations on real roads.